Step 1

Preheat the oven to 350 degrees.

Step 2

Prepare a tube pan by buttering it and dusting it with flour.

Step 3

In a medium mixing bowl, mix together flour, baking powder, and salt. Set aside.

Step 4

Cream together butter and sugar until well mixed.

Step 5

Add one egg at a time mixing as you go.

Step 6

Add vanilla and mix.

Step 7

In a medium bowl, mix together sour cream and baking soda.

Step 8

Alternate adding the flour mixture...

Step 9

Then the sour cream mixture mixing well in between until all wet and dry ingredients are mixed in.

Step 10

In a small bowl, mix the chopped walnuts, sugar, and cinnamon.

Step 11

Spread about two-thirds of the cake batter in the prepared tube pan.

Step 12

Sprinkle half of the walnut mixture on top of the batter.

Step 13

Spread the remaining cake batter on top of the walnut mixture.

Step 14

Add the rest of the walnut mixture on top of the batter. Bake on the center shelf of the oven for one hour. Check it with a toothpick. If it comes out clean it's done; if it needs a little more time try 5 mins.

Step 15

Cool on a rack in the pan for 15 minutes.

Step 16

It's coated with sugar so it's tricky to take out of the pan without messing up the countertop. Use a cookie sheet or large plate to turn it out. Then cool slightly and turn it over again onto the large plate for storing or serving.